Subsections

- Library
- Description
- Dialog Box
- Default properties
- Interfacing function
- Computational function (type 4)

##
Relational operation

### Library

Others

### Description

Comparison operator. The output is 0 or 1.

### Dialog Box

Set parameters |
Operator: == (0), = (1), (2), = (3), = (4), (5) | 2
Use zero crossing (no: 0), (yes: 1) | 0

- Operator: integer for the following operators: equal (0), not equal (1), less (2), less or equal (3), larger or equal (4), larger (5)
- Use zero crossing : 0 or 1

### Default properties

- always active: no
- direct-feedthrough: yes
- zero-crossing: no
- mode: no
- number/sizes of inputs: 2 / 1 1
- number/sizes of outputs: 1 / 1
- number/sizes of activation inputs: 0 /
- number/sizes of activation outputs: 0 /
- continuous-time state: no
- discrete-time state: no
- name of computational function: relationalop

### Interfacing function

`scilab/macros/scicos_blocks/misc/RELATIONALOP.sci`

### Computational function (type 4)

    #include "scicos_block.h"
    #include <math.h>

    void relationalop(scicos_block *block,int flag)
    {
      int i;
      i=block->ipar[0];
      if(flag==1){
        if ((block->ng!=0)&(get_phase_simulation()==2))
          {
    	block->outptr[0][0]=block->mode[0]-1.0;
          }
        else {
          switch (i)
    	{
    	case 0:
    	  if(block->inptr[0][0]==block->inptr[1][0]) {
    	    block->outptr[0][0]=1.0;
    	  }else{
    	    block->outptr[0][0]=0.0;
    	  }
    	  break;

    	case 1:
    	  if(block->inptr[0][0]!=block->inptr[1][0]) {
    	    block->outptr[0][0]=1.0;
    	  }else{
    	    block->outptr[0][0]=0.0;
    	  }
    	  break;
    	case 2:
    	  if(block->inptr[0][0]<block->inptr[1][0]) {
    	    block->outptr[0][0]=1.0;
    	  }else{
    	    block->outptr[0][0]=0.0;
    	  }
    	  break;
    	case 3:
    	  if(block->inptr[0][0]<block->inptr[1][0]) {
    	    block->outptr[0][0]=1.0;
    	  }else{
    	    block->outptr[0][0]=0.0;
    	  }
    	  break;
    	case 4:
    	  if(block->inptr[0][0]<=block->inptr[1][0]) {
    	    block->outptr[0][0]=1.0;
    	  }else{
    	    block->outptr[0][0]=0.0;
    	  }
    	  break;
    	case 5:
    	  if(block->inptr[0][0]>=block->inptr[1][0]) {
    	    block->outptr[0][0]=1.0;
    	  }else{
    	    block->outptr[0][0]=0.0;
    	  }
    	  break;
    	case 6:
    	  if(block->inptr[0][0]>block->inptr[1][0]) {
    	    block->outptr[0][0]=1.0;
    	  }else{
    	    block->outptr[0][0]=0.0;
    	  }
    	  break;
    	}
        }

      }else if(flag==9){
        block->g[0]=block->inptr[0][0]-block->inptr[1][0];
        if (get_phase_simulation()==1) {
          switch (i)
    	{
    	case 0:
    	  if(block->inptr[0][0]==block->inptr[1][0]) {
    	    block->mode[0]=2.0;
    	  }else{
    	    block->mode[0]=1.0;
    	  }
    	  break;

    	case 1:
    	  if(block->inptr[0][0]!=block->inptr[1][0]) {
    	    block->mode[0]=2.0;
    	  }else{
    	    block->mode[0]=1.0;
    	  }
    	  break;
    	case 2:
    	  if(block->inptr[0][0]<block->inptr[1][0]) {
    	    block->mode[0]=2.0;
    	  }else{
    	    block->mode[0]=1.0;
    	  }
    	  break;
    	case 3:
    	  if(block->inptr[0][0]<block->inptr[1][0]) {
    	    block->mode[0]=2.0;
    	  }else{
    	    block->mode[0]=1.0;
    	  }
    	  break;
    	case 4:
    	  if(block->inptr[0][0]<=block->inptr[1][0]) {
    	    block->mode[0]=2.0;
    	  }else{
    	    block->mode[0]=1.0;
    	  }
    	  break;
    	case 5:
    	  if(block->inptr[0][0]>=block->inptr[1][0]) {
    	    block->mode[0]=2.0;
    	  }else{
    	    block->mode[0]=1.0;
    	  }
    	  break;
    	case 6:
    	  if(block->inptr[0][0]>block->inptr[1][0]) {
    	    block->mode[0]=2.0;
    	  }else{
    	    block->mode[0]=1.0;
    	  }
    	  break;
    	}
        }
      }
    }